Features： 1、Aluminum alloy material, lightweight design, anodized, corrosion-resistant. 2、Can be paired with SCG03/05 SingleDisc chain guides. When installing the vertical direction port, it should be perpendicular to the horizontal plane. 3、Applicable specifications: 5way width 68/73 frame, and BSAthreaded CenterAxle, Ximano BB50/BB51/BB70 CenterAxle can be installed, and speedcoupling GXP can also be installed (the 5-way CenterAxle should be an ExternalHanging type, and pressed in and embedded CenterAxles cannot be used). 4、Easy and convenient to install. Specification： This bike accessory is designed to securely hold your bike's chain in place, reducing the risk of chain derailment and ensuring smooth and efficient gear shifting. Made from aluminum alloy materials, it is built to withstand the rigors of intense Cycle, providing long-lasting performances. Features: Aluminum alloy material, lightweight design, anodized, corrosion-resistant. Can be paired with SCG03/05 SingleDisc chain guides. When installing the vertical direction port, it should be perpendicular to the horizontal plane. Applicable specifications: 5way width 68/73 frame, and BSAthreaded CenterAxle, Ximano BB50/BB51/BB70 CenterAxle can be installed, and speedcoupling GXP can also be installed (the 5-way CenterAxle should be an ExternalHanging type, and pressed in and embedded CenterAxles cannot be used). Easy and convenient to install. Specifications: Color: black Material: aluminum alloy Item size: 70 * 68 * 4mm / 2.8 * 2.7 * 0.2in Item weight: 19g / 0.7ounce Package size: 80 * 80 * 10mm / 3.1 * 3.1 * 0.4in Package weight: 58g / 2.0ounce Packing List: 1 * Bike Chain Guide Adapter 9 * Screws 6 * Stainless Steel Washer 1 * Wrench Package List： 1 * Bike Chain Guide Adapter 9 * Screws 6 * Stainless Steel Washer 1 * Wrench